Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
  • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
  • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
  • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
  • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
  • G01D5/2046—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core

Definitions

• the invention relates to a displacement transducer system for switching magnets with at least two coil windings arranged one behind the other on a base coil former.
• Such transducer systems basically work according to the transformer principle. At least one primary winding, one secondary winding and one core rod are required, which are generally connected to the piston-shaped switching part of a switching magnet and which travels the path to be measured within the displacement sensor. A pulsating supply voltage is applied to the primary winding of this arrangement, the secondary winding emitting an output signal in the form of voltage, which changes accordingly as a result of the movement of the core rod.
• driving through provide a positive signal for the one direction of travel of the core rod and a negative signal for the other direction of travel of the output signal through a defined zero point, two secondary windings being required to implement the relevant arrangements.
• the windings are arranged one after the other on a coil body, so that the coil can be easily produced on an industrial scale and achieves the required precision values.
• the disadvantage of this solution is the large overall length due to the two secondary windings arranged one behind the other and the primary winding.
• the primary winding arranged between the two secondary windings prevents the secondary windings from being wound in one operation, so that they are only subsequently connected and contacted, which is expensive in the manufacture of the known displacement transducer system.
• a position measuring section with an elongated secondary coil designed as a measuring coil is known, at the end regions of which primary coils to which an alternating voltage can be applied are arranged in opposite directions.
• a permanent magnet can be displaced along the secondary coil, two magnetic field sensors, which are connected to an electronic area detection device, receiving a measurement signal on the secondary coil, provided the permanent magnet is in a position between the magnetic field sensors.
• the invention has for its object to further develop a displacement sensor system of the type mentioned above in such a way that it can be produced inexpensively and that a shortened overall length can be realized.
• a displacement sensor system with the features of claim 1 solves this problem.
• the primary winding is wound on the base coil former and the two assigned secondary windings on a further coil former, which comprises the base coil body in contact with the primary windings. This also results in a small displacement transducer system for a switching magnet in the radial direction.
• the further coil former is formed from two body halves which can be plugged onto the basic coil former with its two primary windings from both ends.
• the coil form essentially consist of three individual components, which facilitates assembly and creates the possibility of Attachment of the primary windings to wind the two secondary windings continuously on the further bobbin, which saves costs.
• the main coil former has a central web in the longitudinal direction approximately centrally, on which connection points for the winding start and the winding end of primary and secondary windings are provided diametrically opposite one another. This facilitates the machine-to-machine connections of the winding starts and winding ends and thus the mechanical swinging of the windings to the respective bobbin.
• connection points are formed from fixing pins that can be wound around by a winding wire.
• the central web is pierced by a wire guide and has contact surfaces on both sides for the plug-in body halves of the further coil body.
• the winding wire can be guided from one coil side to the other side without any great effort via the groove within the central web, and the respective coil formers can be oriented in relation to the central web via the contact surfaces.
• FIG. 1 shows a partial longitudinal section through the displacement transducer system with connected, partially shown switching magnet
• the displacement sensor system shown in FIG. 1 for a switching magnet designated as a whole as 10 and partially shown has a coil windings 1 8 arranged on two chambers of the base coil former 1 2, which form the primary winding. Forming two secondary windings 20, 22, an additional coil winding 24 is arranged above each coil winding 14, 16 of the primary winding 18. As the cross-section according to FIG. 1 in particular shows, the diameter of the secondary windings 20, 22 can be larger than that of the associated primary winding 18.
• the primary winding 18 is wound on the base bobbin 12 and the two associated secondary windings 20, 22 above it on another Coil body 28, which includes the main coil body 12 in contact with the primary winding 1 8.
• the start of the winding of the primary winding 18 is connected to the first connection point 32, which is also referred to as a pin, and then the left-hand chamber of the main bobbin 1 as viewed in the direction of FIG. 2 2 provided with the coil winding.
• the start of the winding 30 of the primary winding 18 is guided in a first slot 34 of a central web 36, which is part of the base coil former 1 2 in the middle.
• the winding wire is passed through a second groove 38, which is diametrically opposite the first groove 34 (see FIG. 3), in the direction of the chamber of the base coil former, which chamber has remained empty until now 12 relocated, which is then then wound.
• the windings mentioned can take place in several layers and the winding end 40 of the coil winding of the primary winding 18 applied in the second chamber is struck at the second connection point 42 after the winding end 40 has again been partially guided through the first groove 34 of the central web 36.
• the base coil bobbin 12 produced in this way with the primary winding 18 is shown at the bottom in the direction of view in FIG. 2 and shows the third production step.
• the coil windings 14 and 16 run in chambers separated in several layers between the two end flanges 44 of the base coil former 12 and the opposite contact surfaces 46 of the central web 36 assigned to the end flanges 44.
• the first groove 34 Triangular in cross section and the second groove 38 has a rectangular shape in cross section, with both grooves 34, 38 opening outwards to the surroundings.
• the further coil body 28 is then composed of two symmetrically constructed body halves 48, 50 which produce the respective secondary winding 20, 22 and which on the base coil body 12 with its two coil windings 14, 16 of the primary winding 18 from both ends forth, ie via their end flanges 44, can be plugged on.
• the body halves 48, 50 which form two winding chambers, are secured in their position by means of a position lock (not shown) against rotation after being pushed onto the main spool body 12 relative to the latter.
• the inside abutment flange of the body halves 48, 50 is perforated with a through-groove which, together with the grooves 34, 38 in the central web 36, forms a common groove course for guiding the winding. Consequently, the secondary winding wire can also be guided from one side of the coil or from one half of the body 48 to the opposite 50 without interruption.
• the body halves 48, 50 can be designed as snap-on parts which can be snapped on and locked onto the base bobbin 12 by hand without the need for greater assembly pressure.
• FIG. 1 After the body halves 48, 50, with the formation of the further bobbin 28, are slid onto the main bobbin 1 2 with its primary winding 18 and are at the end in contact with the associated contact surfaces 46 of the central web 36, the top view is seen in FIG illustrated winding step the winding start 52 of the first secondary winding 20 struck the third connection point 54.
• This third connection point 54 is also part of the central web 36, as shown in particular in FIG.
• the direction of rotation for winding the chamber of the first half of the body 48 is indicated by an arrow at the top left as viewed in the direction of FIG.
• connection points 32, 42 of primary winding 18 and the connection points 54 and 60 of the respective secondary winding 20, 22 are arranged diametrically opposite one another in pairs, preferably in one piece on the central web 36.
• the respective connection points 32, 42, 52 and 60 are formed by the protruding fixing pins that can be wrapped around the respective winding wire (cf. FIG. 3).
• the further coil body 28 with its body halves 48, 50 to be displaceably arranged in predefinable positions on the basic coil body 12 with its primary winding 18.
• the base coil body 12 is penetrated by a core rod 62, which cooperates with the piston-shaped switching part 64 against the force of a compression spring 66 in the usual and therefore not described in detail.
• the central recess 68 of the main coil former 1 2 is also circular in cross section in the region of its central web 36 for receiving the cylindrical core rod 62.
• the two secondary windings 20, 22 are surrounded by a cylindrical cover 70, which in turn is surrounded on the outside by an iron jacket 72. is enclosed on the catch side.
• the iron sheath 72 is crimped inwards at its two opposite ends and therefore holds the coil arrangement between flange segments 74 arranged on the end face.
• there is an end-side electrical contact 76 which supplies the primary winding 18 with the pulsating supply voltage and otherwise the measured value acquisition on the secondary windings 20.22 allows.
• the entire displacement transducer system is arranged in a displacement transducer housing 78 which can be connected on the end face to a housing 80 of the switching magnet.
• the displacement transducer system according to the invention ensures that the output signal can change linearly with the travel of the core rod 62. External interference fields, for example caused by magnetic stray fields or the like, cannot adversely affect the signal in the present arrangement. Furthermore, it is ensured that the ratio of the measuring section to the length of the displacement sensor system is as large as possible and is therefore favorable. Furthermore, it is ensured by the arrangement according to the invention that the output signal and the optionally mechanically adjustable zero point only change within very narrow limits when the temperature changes and therefore do not adversely affect the measurement result.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7833165

Family Applications (1)

Country Status (6)

Families Citing this family (15)

Citations (3)

Family Cites Families (2)

• 1997
  • 1997-06-20 DE DE19726256A patent/DE19726256C1/de not_active Expired - Fee Related
• 1998
  • 1998-03-23 JP JP50362999A patent/JP3930057B2/ja not_active Expired - Fee Related
  • 1998-03-23 US US09/446,248 patent/US6346870B1/en not_active Expired - Fee Related
  • 1998-03-23 WO PCT/EP1998/001679 patent/WO1998059217A1/de active IP Right Grant
  • 1998-03-23 EP EP98917052A patent/EP0990121B1/de not_active Expired - Lifetime
  • 1998-03-23 PT PT98917052T patent/PT990121E/pt unknown
  • 1998-03-23 DE DE59802967T patent/DE59802967D1/de not_active Expired - Fee Related

Patent Citations (3)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events